A good tip about fire safety and batteries. Tape over or cap the terminals of batteries when they are loose!
Starting a
fire with a 9 Volt battery and steel wool is a quite know trick. 9 Volt
batteries are easy to short, both terminals are right next to each other. So
any piece of metal can touch them and short them out. Even if the materials shorting the terminals
might not catch fire, the batteries does get extremely hot and can cause combustibles
nearby to burn. So remember when tossing 9 Volt batteries in a bag of other
batteries or in your junk draw, tape or cap them!
A far more detailed rapport about 9V battery issues can be found here at Richard Friedrich lab journal: http://friedrichengineering.com/web_documents/9volt%20Battery.pdf
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